Internet Archive BookReader - A Letter from Sir Hans Sloane Baronet, Late Pr. R. S. to Martin Folkes Esquire Pr. R. S. Containing Accounts of the Pretended Serpent-Stone Called Pietra de Cobra de Cabelos, and of the Pietra de Mombazza or the Rhinoceros Bezoar, Together with the Figure of a Rhinoceros with a Double Horn